Rice Lake RailBoss™ Rail Scales - Installation Manual - Manual (Page 17)

Calibration 13
5.3.1 Front Panel Calibration
The CALIBR submenu (under the SCALES menu, see
Figure 5-6) is used to calibrate the 920i. The zero,
span, and linear calibration point displays provide a set
of softkeys used specifically for calibration procedures:
+/– Toggles to allow entry of negative or
positive values
Last Zero Recalls the last established zero value to
allow calibration without removing tests
weights or product from scale.
Calibrate Performs calibration for the selected
point
Temp Zero Temporarily zeroes the displayed weight
o f a n o n - e m p t y s c a l e . A f t e r s p a n
calibration, the difference between the
temp zero and the previously calibrated
zero value is used as an offset.
Millivolts (or Counts )
Toggles between display of captured A/
D counts and captured millivolts values;
allows entry of calibration values in mV
or counts
03/01/2011 01:57PM
Calibrate
WZERO WVAL REZERO
1291
Deadload Calibration
+/- Millivolts
Zero Count =>
Last Zero Temp Zero
CALIBR
SCALE1
SCALES
Figure 5-6. WZERO Calibration Display
To calibrate the indicator using the front panel, do the
following:
1. Ensure the J-Box trimming procedure has been
successfully completed.
2. Place the indicator in setup mode by removing
t h e l a rg e f i l l i s t e r- h e a d s c r e w f r o m t h e
enclosure. Insert a screwdriver or similar tool
into the access hole and press the setup switch
once. The indicator display changes to show
scale configuration menus.
3. With the SCALES menu highlighted, press the
down key, then select the Scale 1. Press down
again ( GRADS parameter highlighted), then
press left to highlight the CALIBR submenu (see
F i g u r e 5 - 5 ) . P r e s s d o w n t o g o t o z e r o
calibration ( WZERO ). See Figure 5-6.
4. Ensure scale reading is at zero, then press down
again to show the current WZERO value, then
press the
Calibrate softkey to calibrate zero.
When complete, the new A/D count for the
zero calibration is displayed. Press
Enter to
save the zero calibration value and go to the
next prompt (
WVAL ).
5. With WVAL displayed, press down to show the
stored calibration weight value. Use the
numeric keypad to enter the actual value of the
RailBoss Calibrator load to be used (30,000
lbs. is recommended), then press
Enter to save
the value and go to span calibration ( WSPAN ).
6. Use the RailBoss Calibrator to place a 30,000
lb. load on the scale. Press down again to show
the current WSPAN value, then press the
Calibrate softkey to calibrate span. When
complete, the new A/D count for the span
calibration is displayed. Press
Enter again to
save the span calibration value and go to the
next prompt (
WLIN ).
7. When complete, press the Save and Exit softkey
to exit setup mode.